EP 0383587 B1 19921111 - A RING RESONATOR GYRO
Title (en)
A RING RESONATOR GYRO
Publication
Application
Priority
GB 8903427 A 19890215
Abstract (en)
[origin: EP0383587A1] To overcome Kerr effect induced gyro bias in a ring resonator optical gyro, the intensities of the beams travelling in opposite directions around the ring have to be very accurately matched. To achieve this a ring resonator gyro includes a first optical coupler (6), the coupling ratio of which is variable and which divides light from a laser (1) into a first and a second component of generally equal intensity, a second optical coupler (8) which transmits a predetermined proportion of the first component to one input of the ring resonator (15) for transmission around the ring resonator (15) in one sense, and a third optical coupler (9), the coupling ratio of which is variable to couple a variable proportion of the second component to the other input of the ring resonator (15) for transmission around the ring resonator (15) in the opposite sense. The gyro also includes a detector (16) for sensing the intensity of light scattered from the optical ring resonator (15), first varying means periodically varying the coupling ratio of the first coupler (6), sensing means responsive to the output of the detector (16) as the first varying means varies the coupling ratio of the first coupler (6) to sense the difference in intensity in the first and second components travelling around the ring (15), and second varying means to vary the coupling ratio of the third optical coupler (9) and thus the intensity of the second component during alternate periods so that the time averaged intensity of both the first and second components are equal.
IPC 1-7
IPC 8 full level
G01C 19/72 (2006.01)
CPC (source: EP US)
G01C 19/727 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0383587 A1 19900822; EP 0383587 B1 19921111; DE 69000440 D1 19921217; DE 69000440 T2 19930325; GB 2228319 A 19900822; GB 8903427 D0 19890405; GB 9003489 D0 19900411; JP 2909513 B2 19990623; JP H02278115 A 19901114; US 5098188 A 19920324
DOCDB simple family (application)
EP 90301599 A 19900215; DE 69000440 T 19900215; GB 8903427 A 19890215; GB 9003489 A 19900215; JP 3263890 A 19900215; US 47943290 A 19900214